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1)Sometimes, many related species evolve from a single species in a relatively short period of time. This often happens as the ancestral species has the opportunity to adapt to new environmental niches. Which of the following terms is NOT relevant to this process?
A)adaptive radiation
B)cladogenesis
C)divergent evolution
D)All of the terms are relevant.
2)Geographically isolated populations become separate species when
A) they have been separated for ten or more generations.
B)their markings become distinct.
C)they are no longer able to interbreed.
D)their skeletal structures become distinct.
3)According to the biological species concept, the termspecies has been defined as a group of organisms that canbreed with one another in a wild, free-ranging condition to producefertile offspring. For which of the following would this concept bemost difficult to apply?
A)lizards
B)plants
C)sponges
D)B and C
4)Speciation is the process by which new species arise. Speciation does not result from which of the following?
A)geographic isolation
B)reproductive isolation
C)genetic divergence
D)species interbreeding
5)Allopatric speciation is a form of speciation that occurs when populations become geographically isolated from one another. Geographic isolation may occur when
A)continents drift apart.
B)a mountain range separates formerly connected populations.
C)the range of a species is limited by loss of suitable habitat.
D)all of the above
6)Which of the following is an example of adaptive radiation?
A)the 13 different species of finches Darwin found on the Galapagos islands
B)the new species of rhea that was found on the opposite side of the river from the older species of rhea
C)the fact that dogs and coyotes can interbreed to produce fertile offspring
D)the observation that small populations have a greater opportunity for genetic changes
7) Under which of the following conditions does adaptive radiation occur?
A)A population invades an island that contains a number of unexploited niches and variation in environmental conditions.
B)Members of a population are isolated from other members of the population, either by geographic isolation or reproductive isolation.
C)A geographical barrier is removed between two populations that were originally one population.
D)A hybrid of two populations breeds successfully with a member of one of the parent populations.

I have finished every question but this one. Please help?!
Invasive species often reach a large biomass because
A.) they are better competitors than native species
B.) they are usually producers and not top predators
C.) they often lack natural predators or pathogens
D.) their superior ability to disperse enables them to spread new niches
E.) they are often protected by the humans who have introduced them

question 11) if an exotic bird species tha feeds on acacia seeds were introduced to this community in this habitat, which existing species would be expected to be most affected by this introduction?explain
question12) a species was identified as having niche with a high degree of niche overlap with the red rumped parrot in terms of its use of food resources.what predcitions would you make abt this species?

What factors interact to produce smog?
a. sunlight and pollutants from fossil fuels
b. particulates and pollutants from fossil fuels
c. sunlight and oxygen
d. sunlight and acid rain
Which of these practices has contributed to the depletion of fish populations worldwide?.
a. fishing bans
b. catching reproduction-age fish
c. rotating catches
d. harvest reduction
Question 4
A predator might control an introduced species by
a. keeping the population from increasing.
b. causing habitat fragmentation.
c. increasing available niches.
d. reducing biodiversity in the area.
Question 5
Which level of the food chain is most affected by biomagnification?
a. secondary consumers
b. producers
c. tertiary consumers
d. primary consumers
What would Earth be like without the greenhouse effect?
a. the same temperature as it is now
b. too cold to be habitable
c. a little cooler than it is now
d. a little warmer than it is now
Question 7
Cutting down an entire forest ecosystem is known as
a. selective cutting.
b. clear cutting.
c. harvest reduction.
d. sustainable development.
Question 8
Which of these would probably lead to a decrease in global warming?
a. an increase in the amount of water vapor in the atmosphere
b. a decrease in the amount of methane in the atmosphere
c. an increase in the amount of carbon dioxide in the atmosphere
d. a decrease in the amount of oxygen in the atmosphere
Question 9
What are renewable resources?
a. resources that formed over millions of years
b. resources that can replenish themselves over time
c. resources that exist only in rural areas
d. resources that are used faster than they form
Question 10
How many people can Earth support?
a. 20 billion
b. 50 billion
c. an unknown number
d. 10 billion
Question 11
Because the manatee is an umbrella species, protecting it may lead to
Choose one answer.
a. protection of many other species.
b. pollution of waterways.
c. decreased seagrass.
d. increased boating in their habitat.
Question 12
Which of the following is correct?
a. All ozone in the atmosphere is harmful.
b. Ozone in the stratosphere is helpful but ground-level ozone is harmful.
c. All ozone in the atmosphere is helpful.
d. Ozone in the stratosphere is harmful but ground-level ozone is helpful.
n what biome is biodiversity the highest?
a. temperate forests
b. deserts
c. grasslands
d. tropical rain forests
Question 14
Canned tuna made from small fish is generally considered to be safer to eat than canned tuna from large fish. Large fish have more pollutants
a. because they drink more water.
b. because they live in more polluted water.
c. due to their larger surface area.
d. due to biomagnification.
Question 15
How has the introduction of kudzu affected native species in the southeastern United States?
a. It has increased erosion, so native plants cannot grow.
b. It has covered native plants, depriving them of sunlight.
c. It has attracted animals that eat native plants.
d. It has helped native plants survive harsh weather.
Why are frogs sensitive to pollutants in water?
a. They are not an indicator species.
b. They have a small body mass.
c. They need low-oxygen conditions.
d. They have water-soluble skins.
Question 18
Which statement best describes Earths human carrying capacity?
a. increasing due to improved technology and medicine.
b. decreasing due to increasing population.
c. decreasing due to decreasing death rates.
d. a fixed number that we will soon exceed.
Question 19
Why are humans less sensitive than frogs to pollutants in water?
a. Humans do not have water-soluble skin.
b. Humans do not need water.
c. Humans are affected only by airborne pollutants.
d. Humans need low-oxygen conditions.
Question 20
What causes the level of carbon dioxide in Earths atmosphere to rise and fall over hundreds of thousands of years?
a. ice ages
b. the greenhouse effect
c. natural climate cycles
d. human activities

1 Answer:
Populations of rabbits usually are counted by marking with
a. paint.
b. transmitters.
c. ear tags.
d. leg bands.
2 Answer:
A prey population usually decreases as a predator population
a. increases.
b. decreases.
c. emigrates.
d. stays the same.
3 Answer:
Food chains connected together are called
a. competitors.
b. a food web.
c. populations.
d. communities.
4 Answer:
A population might be increasing because the
a. birth rate is decreasing.
b. death rate is decreasing.
c. birth rate is increasing.
d. both b and c.
5 Answer:
Which of the following is not a limiting factor?
a. nutrients
b. emigration
c. water
d. space
6 Answer:
Predator-prey relationships
a. are limiting factors.
b. affect both plants and animals.
c. affect only prey populations.
d. affect only predator populations.
7 Answer:
The second link in a food chain could be a
a. dog.
b. cow.
c. tree.
d. owl.
8 Answer:
Food is made in a community by
a. all consumers.
b. decomposers.
c. both a and b.
d. producers.
9 Answer:
The job of an organism in a community is called
a. limiting factors.
b. a habitat.
c. a niche.
d. competition.
10 Answer:
Which of the following causes an increase in population size?
a. limiting factor
b. emigration
c. immigration
d. competition
11 Answer:
Limiting factors keep populations from
a. starving.
b. emigrating.
c. increasing.
d. decreasing.

1)Plasmids are transferred from one bacterium to another through
conjugation.
chemoautotrophs.
flagellae.
bacterial capsules.
2)The origin of membrane-enclosed cells is thought to include the formation of
extremophiles.
microspheres.
ribosomes.
eukaryotes.
3)Two species occupying the same niche would be __________ with each other.
in competition
at peace
coevolving
in harmony
4)The mineralized remains of an organism is called a(n)
fossil.
homologous feature.
adaptation.
population.
5)Calling a species by its genus and species name, such as Homo sapiens, is using
cladistics.
binomial nomenclature.
phylogeny.
taxonomy.
6)The isolation of two groups within a population from each other, and their adaptation to the point of being no longer able to interbreed is called
population genetics
gradualism.
speciation.
convergence.
7)The ecological role of a species is its
niche.
energy pyramid.
habitat.
community.
8)A classification system based solely on derived traits is called
phylogeny.
cladistics.
domains.
genetic drift.
9)The theory that organelles originated as separate prokaryotic symbionts is called
relative dating.
endosymbiosis.
mass extinctions.
geologic time.
10)Comparing a new fossil to a previously-dated fossil in order to determine its age is a form of
relative dating.
radiometric dating.
half-life.
geologic time.
11)Applying crystal violet stain, followed by iodine, alcohol, and safranin, a bacterial culture looked purple. The bacteria was
transduced.
Gram positive.
transformed.
Gram negative.
12)All the members of one species in a given area is its
biodiversity.
carrying capacity.
growth.
population.
13)The disappearance of a species from the Earth is referred to as
deforestation.
extinction
biodiversity.
recycling.
14)When a population does not show any net change in its gene pool, it is
using random mating.
in genetic equilibrium.
about to go extinct.
isolated reproductively.
Please help me.